Occasional PaJ>crs of the Museiun of Zoology 13 



cies taken near Bolivar, Colombia, were sent to Drs. Calvert 

 and Ris, who independently identified them as pygmaciis. Un- 

 fortunately Mr. Campion was not able to compare the Colom- 

 bian specimen sent him with the type of pygniaeus in the Mac- 

 Lachlan collection. This type came from Bogota, which means 

 little in this connection as a definite locality. The existence 

 of another very similar but distinct species at Chapada, Brazil, 

 to which the description of de Selys is in some respects more 

 applicable than to the Central American and northern coastal 

 Colombian species throws doubt on the identity of these north- 

 ern specimens. Moreover, in the Carnegie Museum there is 

 another female Progomphus from Chapada of similar size, 

 lacking the entire abdomen, but having the anal area distal to 

 the triangle two cells wide or more. We are therefore sure 

 that at least three small species of Progomphus exist, and that 

 only one name is available. It seems to me very probable that 

 other species will be found and that one of these, at present 

 not known, or, less likely, the Chapada female, described by 

 Calvert, and compared above with the Bolivar specimens, will 

 be found to be the true pygmaciis, and that the Central Ameri- 

 can and northern Colombian species will be found to require 

 a new name. Comparison of material I have sent to Mr. Cam- 

 pion with the de Selys type in MacLachlan's collection will . 

 settle this matter. Until that time it is well to bear in mind 

 that at the time de Selys described pygniaeus he knew certain- 

 ly six or seven more species of the genus, and he said "pyg- 

 niaeus is very distinct by the distal side of the triangle of the 

 front wing more angled than in any other species." The re- 

 markable thing about the triangle of the front wing in the 

 specimens from Bolivar, Colombia, is the short anterior side 

 of the triangle. The distal side is not unusually angled. De 

 Selys also speaks of the distal side of the triangle of the hind 



